Phononic materials used to control turbulent flow

Patent metadata

Field	Value
Publication number	US-10830262-B2
Application number	US-201715636639-A
Country	US
Kind code	B2
Filing date	Jun 29, 2017
Priority date	Jul 28, 2014
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A phononic material and a method of using a phononic material for use in interacting with a fluid or solid flow are provided. The phononic material includes an interface surface and a subsurface feature. The interface surface is adapted to move in response to a pressure, and/or velocity gradients, associated with complex motion of a turbulent flow exhibiting a polarity of frequencies exerted on the interface surface. The subsurface feature extends from the interface surface. The subsurface feature comprises a phononic crystal or locally resonant metamaterial adapted to receive the pressure, and/or velocity gradients, from the turbulent flow via the interface surface and alter the phase and amplitude of a polarity of frequency components of the turbulent flow in order to reduce or increase the kinetic energy of the turbulent flow. The interface surface is adapted to vibrate at a polarity of frequencies, phases and amplitudes in response to the frequency, phase and amplitude of at least one component of the turbulent flow.

First claim

What is claimed is:

1. A phononic material for use in interacting with a turbulent fluid or solid flow, the phononic material comprising:
an interface surface adapted to be disposed juxtaposed a turbulent flow and to move in response to at least one of a pressure and a velocity gradient associated with complex motion of the turbulent flow exhibiting a plurality of frequencies exerted on the interface surface; and
a subsurface feature extending from the interface surface, the subsurface feature comprising a phononic crystal or locally resonant metamaterial adapted to receive the at least one of the pressure and the velocity gradient from the turbulent flow via the interface surface and alter phase and amplitude of a plurality of frequency components of the turbulent flow.

2. The phononic material of claim 1 wherein the complex motion comprises a plurality of frequency domain components.

3. The phononic material of claim 1 wherein the complex motion comprises a plurality of frequency domain components across a spectrum of frequencies.

4. The phononic material of claim 1 wherein the interface surface is adapted to vibrate at a plurality of frequencies in response to the at least one of the pressure and the velocity gradient.

5. The phononic material of claim 1 wherein the interface surface is adapted to vibrate at a plurality of frequencies, phases and amplitudes in response to at least one component of the turbulent flow selected from the group comprising: frequency, the pressure, and the velocity gradient.

6. The phononic material of claim 1 wherein the subsurface feature comprises a negative net performance metric, P C =∫ ω l ω u P(ω)dω, wherein ω l and ω u comprise lower and upper frequencies, respectively, of a dominant energy range in the turbulent flow.

7. The phononic material of claim 6 wherein the subsurface feature is adapted to reduce kinetic energy within the turbulent flow.

8. The phononic material of claim 6 wherein the subsurface feature is adapted to reduce formation or development of an energy cascade characteristic of partially or fully developed turbulence.

9. The phononic material of claim 6 wherein the subsurface feature is adapted to reduce friction drag caused by the turbulent flow along the interface surface.

10. The phononic material of claim 1 wherein the subsurface feature comprises a positive net performance metric, P C =∫ ω l ω u P(ω)dω, wherein ω l and ω u comprise lower and upper frequencies, respectively, of a dominant energy range in the turbulent flow.

11. The phononic material of claim 10 wherein the subsurface feature is adapted to enhance kinetic energy within the turbulent flow.

12. The phononic material of claim 10 wherein the subsurface feature is adapted to increase formation or development of an energy cascade characteristic of partially or fully developed turbulence.

13. The phononic material of claim 10 wherein the subsurface feature is adapted to increase friction drag caused by the turbulent flow along the interface surface.

14. The phononic material of claim 10 wherein the subsurface feature is adapted to increase mixing within the turbulent flow.

15. The phononic material of claim 10 wherein a fluid-structure interaction through the interface takes place over numerous cycles or temporal periods.

16. The phononic material of claim 1 wherein the interface surface is disposed juxtaposed a flow surface.

17. The phononic material of claim 1 wherein the interface surface is disposed at a flow surface or behind a flow surface and is adapted to interact with a flow.

18. The phononic material of claim 1 wherein a flow surface is interposed between the interface surface and a flow and the interface surface is adapted to interact with the flow through the flow surface.

19. The phononic material of claim 1 wherein the interface surface is integrated with a flow surface.

20. The phononic material of claim 1 wherein the turbulent flow comprises one or more of an internal flow and an external flow.

21. A method of controlling a flow comprising:
providing an interface surface juxtaposed a turbulent flow;
receiving at least one of a pressure and a velocity gradient associated with complex motion of the turbulent flow exhibiting a plurality of frequencies exerted on the interface surface; and
receiving the at least one of the pressure and the velocity gradient, via a subsurface feature extending from the interface surface, the subsurface feature comprising a phononic crystal or locally resonant metamaterial;
altering phase and amplitude of a plurality of frequency components of the turbulent flow via the subsurface feature; and
vibrating the interface surface at a phase and amplitude of a plurality of frequency components of the turbulent flow.

22. The method of claim 21 wherein the complex motion comprises a plurality of frequency domain components.

23. The method of claim 21 wherein the interface surface is adapted to vibrate at a plurality of frequencies in response to the pressure and/or velocity gradients.

24. The method of claim 21 wherein the interface surface is adapted to vibrate at a plurality of frequencies, phases and amplitudes in response to the frequency, pressure, and/or velocity gradients of at least one component of the turbulent flow.

25. The method of claim 21 wherein the subsurface feature comprises a negative net performance metric, P C =∫ ω l ω u P(ω)dω, wherein ω l and ω u comprise lower and upper frequencies, respectively, of a dominant energy range in the turbulent flow.

Assignees

• Univ Colorado Regents

Inventors

• Hussein Mahmoud
• Biringen Sedat

Classifications

• G10K11/16

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title

• F15D1/003

  comprising surface features, e.g. indentations or protrusions (F15D1/0055, F15D1/006 take precedence) · CPC title

• F15D1/006 Primary

  comprising moving surfaces, wherein the surface, or at least a portion thereof is moved or deformed by the fluid flow · CPC title

• B64C21/10

  using other surface properties, e.g. roughness · CPC title

• G10K11/162

  Selection of materials · CPC title